2171045791 has 4 divisors (see below), whose sum is σ = 2221535272. Its totient is φ = 2120556312.

The previous prime is 2171045783. The next prime is 2171045827. The reversal of 2171045791 is 1975401712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2171045791 - 2³ = 2171045783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2171045791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171045711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25244676 + ... + 25244761.

It is an arithmetic number, because the mean of its divisors is an integer number (555383818).

Almost surely, 2^2171045791 is an apocalyptic number.

2171045791 is a deficient number, since it is larger than the sum of its proper divisors (50489481).

2171045791 is an equidigital number, since it uses as much as digits as its factorization.

2171045791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50489480.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 2171045791 is about 46594.4824094012. The cubic root of 2171045791 is about 1294.8605348633.

The spelling of 2171045791 in words is "two billion, one hundred seventy-one million, forty-five thousand, seven hundred ninety-one".